Feeding mechanism for sewing-machines.



A. H; DE VOE. FEEDING MECHANISM FOR SEWING MACHINES- APPLICATION FILEDJUNE 3. 1914.

Patented Apr. 15, 1919.

2 SHEETS-SHEET I.

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APPLICATION FILED JUNE 3,19I4.

Patented Apr. 15, 1919.

2 SHgETS-SHEET 2- WITNESSES.

- A TTORIVEV ALBERT H. DE

von, 0]? WESTFIELD, NEW JERSEY, ASSIGNOR ro THE SINGER MANUFACTURINGC01V[]?ANY,'A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filed June 3, 1914. Serial No. 842,595.

To all whom it may concern.

Be it known that I, ALBRT H. DE Von, a citizen of the United States,residin at Westfield, in the county of Union and tate of New Jersey,have invented certain new and useful Improvements in Feeding Mechanismsfor Sewing-Machines, of which the following is a specification,reference being had thereinto the accompanying drawings.

This invention relates. to feeding mechanism for that class of sewingmachines adapted more especially for stitching heavy or stiff goods suchas canvas and the like, which employ auxiliary feeding mechanism to aidthe main feed-dog to properly advance the work through the machine.

In the present construction the machine is provided with the usualreciprocating needle and cooperating loop-taker mechanism, actuated froma main-shaft mounted in bearing-supports rising from the bed-plate belowthe usual overhanging arm. The main feed-bar is pivotally connected toand projects forwardly of a feed-rocker, and at its forward end issupported by the strap of a lifting eccentric on the main-shaft. To thefeed-rocker is connected one end of a pitman provided at its oppositeend with'a strap embracing a second eccentric on the main shaft, whichserves to impart operative movements to the feed-rocker and hencefeeding movements to the main feed-bar which receives rising and fallingmovevments from the first named eccentric.

Supported above the bed-plate at therear of the main feed-dog by asuitable sustaining member is a vertically-movable springpressedfeed-roller which cooperates with an arcuately movable, rising andfalling, auxiliary feed-dog. The auxiliary feed-dog is formed with aserrated'curved surface to correspond with the surface of thefeedroller, and is provided with a sliding post which fits within thebearing sleeve of a rocking carrier journaled within suitable bearingsupports at the rear of the main feed-dog. The auxiliary feed-dogcarrier is 'ven its rocking movements by means 0 an adjustable linkconnection with the feedrocker which actuates the main feed-bar, so thatsimultaneous feeding movements are imparted to both the mainand-auxiliary feeddogs from a common actuating member. The connectionbetween the mainshaft and the feed-rocker permits a change in the throwof both feed-dogs by one adustment; and the connection between saidrocker and the auxiliary dog is such as to permit an independentadjustment of the latter to change the length of tively to the mainfeed-dog. The means for imparting rising and falllng movements to theauxiliary feed-dog comprise an elbow-lever pivotally mounted upon ablock. clamped upon the bearing sleeve of the carrier which receives theslidlng post of the auxiliary feed-dog. A link connects one arm of theelbow-lever withthe auxiliary feed-dog, and to the second arm of theelbow-lever is connected, either directly or through'certaininstrumentalities, the rearwardly extending end of'a pitman whichreceives reciprocatory' movements from a third eccentric on themain-shaft;

The construction above set forth provides a positively driven auxiliaryfeeding member which is so connected with. the actuating mechanismforthe main feed-dog that its feeding movements are simultaneous withthelatter and of the same length, or of a greater or less length, asdesired.

In the drawings, Figure 1 is a perspective View of the lmprovementsapplied the main-shaft is journaled in bearing supports rising from thebed-plate below the overhanging arm, the machine being shown in dottedlines. Fig. 2 is a side" elevation, partly in section, of the main andauxiliary feeding members and the operative connec tions between thesame and the main-shaft of the sewing machine. Fig. 3 is a perspectiveview of the rocking carrier for the auxiliary feed-dog; and Fig. 4 is aPerspective view of the auxiliary feed-dog, the elbowlever which impartsrising and falling movements thereto, and certain connecting elements.Fig. 5 is a perspective view of a sewing machine provided with amodified form of the improvements. Fig. 6 is a perspective view ofcertain elements of the auxiliary feed-lift, as employed in the modifiedf form of the improvements. "Fig. 7 is a perspective view of thethroat-plate, and Fig. 8 is a similar view of the presser-roller andconnected parts employed in the modified form of the improvements.

As represented in the drawings, vention is shown in connection with asewing machine constructed with the bed-plate its throw relato a Singersewing machine of a type in which the inp A, standard B, and overhangingarm G in which is journaled the needle-actuating shaftlfthe latter-beingoperatively connected with theusualreciprocatory needlebar 2 carryingneedle The needle-actuating shaft"1'receives 0p erative movementsthroughconnections with the main -shaft4-whiclris journaled in suitablebearings within the standard B and a bearing support 5 rising from thebed-plate A The main-shaft carries at its end-the usual balance-wheel 6andi's provided with a feed-lifting; eccentric? WlllCl'l is embracedby}"the strap 8; of a short pitinan 9, provided at its end with anapertureto receive a pivotal stud 10 which passes through a similaraperture formed in feed-bar 11, the latter being formed with a verticalchannel to receive the supporting post 12 of the main fe'ed-dog 13.which is held in position by means of a fastening screw 14.

The' enlarged rearwardly extending end otthe vfeed-bar 11 is formed witha trans verse aperture to receive a-pivotal stud 15 supported withinthe. bearing bosses 16 01 the yoke-arm 16 forming part of'a feedrockercompri'singth'e arms 16, 17', 18 pro jecting from the hollow rockshaft19 pivotally supported at each end by means of suitable center screwsfitted'within bearing bosses onthe bed-plate A. One of said centerscrews is indicated by-the numeral 20' iii/Fig. 1, a cuppedbearing disk21 being mterposed between said screw and the hol- 3-5 low' rock-shaft,said disk being suitably ing nut 24 and a washer 28 surrounding the-stud-screw 24 adjacent arm 17.

Rising from the bed-plate at therear of the main feed-dog 13 are arms Dand E, the latter being provided with asubstantially U shapd extension Ewhich adapted to sustain a p1'esse1'roller for use in conjunction with"an auxiliaryjfeeding member; as hereinafter more fully described. I

Fitted within v suitable bearings supported by the members D and E arethejfulcrum 'pins29 of a carrier-block formed with a" verticalaaperturewithin which "is fi'tted a bearing sleeve 31 which receives the sliding:

post 320i auxiliary feed-dog '33, the under facefof' the dog beingformed With a depres- 6' sion or annular recess to receive the slightlytwo "supporting I 5 M enlarged head of the post, and thetwo menn bersbeing secured together by means of a "screw 34. Uponone fulcium-piii-QS)of the rocking carrier is fittedthe enlarged apertured and splitend 35.vof a crank-arm 35, said arm being clamped upon the pin by means of ascrew 36*. In the opposite, end of the arm 35 is similarly clamped meatscrew 37which passes through one end of a link-bar 38, the opposite endof said link bar being connected to arm 18- of the feed'-,

rocket: It will 'be seen thatit-he link-bar may be adjusted toward andfrom the axis of the feed-rocker to vary the movement of therocking-carrier 31 and thus the throi'vf of the auxiliary feed-dog 33,such adjustmentbeing e fitected by loosening the nut 40.011]

stud-screw 39 to permi't'sa-id screw 'to be moved within'the slot 41 ofthe'arm 18.

An elbow-lever 42 is employed toim'p'art rising and ralhng movements tothe auxiliary feeddog "33. The said elbow-lever is provided with 'a boss42' which-fits upon astud 43 projecting laterally from-asplitfandapertured block 44 clamped upon the bearing-sleeve 31- of the 'rockingcarrier 301 @ne end of the elbowdever' is apertured-to receive astud-screw 45 Which is held in position by means of nut'46.Theprojecting end of stud fits within the lower" transverse boss 46* ofa link 47, the upper similarly formed boss of which fits betweenthe'apertured lugs 48 of the auxiliary feed-dog 38, a pin 49 being employedto pivot-allv connect said link and the dog; the pin being'heldinposition by means of clamping:

screws 50. i

It will be seen that theactuat'lonof elbow lever 42 will impart verticalreciprocatory .or

rising and falling movements to the feeddog, during which movements thepost '82 will slide within the bearing sleeve 31ot carrier 30. i Theauxiliary dog rises immediately after the carrier 30 moves the same toits forward position prior .to a feeding movement; and at thetermination of the feeding movement. said feed-dog is-lowered by thereverse movement otthe elbow lever 42. The elbow-lever is operated bymeansv ot a pitman connection with'a'n eccentricon the main-shaft, therear end of the pitman 51'- being apertured to receive a stud 52 on onearm of the elbow-lever, and the forwardly pro ecting T-shaped end 51* ofthe pitman fits u )on and is )rovidedwith astraDfSS l a l whichembraces'the eccentr1e54ysa1d strap, being held in position bymeansofserewsz The block 801s cut awayf'ad acent the bearing sleeve 31to form are'eess-fto rece "61 and that end of the pitman connected andpermit movement of the elbow lethereto.

A vertically movable p resser-rolleris, e'm ployed inCOHJllIlCtIOn'Witll the auxiliaryi feed-dog. As 'hereinbefore stated;

, presser-roller is sustained by the extension E of bearing support E,said extension being provided'at its upper end with parallel verticalbearing bosses 56 and 57. The toothed presser-roller 58 is mounted on ahorizontal stud 59 supported by the downwardly extending arms 6O of abracket 60 provided on its upper face with the supporting pin 61 whichfits loosely within boss 56 of the extension E. The bracket also carriesa guidepin 62 which slides within boss 57 of said extension. The pin 61is provided with an ad justable stop-ring 63 which abuts the upper faceof boss 56 and limits the downward movement of the feed-roller, beingheld in its adjusted position by means of a clamping-screw 64.Intermediate the lower face of boss 57 and the upper face of bracket 60and surrounding the guide-pin 62 is a coiled spring 65 which acts topress the feed-roller downwardly into engagement with the fabric. Theupper portion of the coiled spring 65 is engaged by the lower end of ahollow thumb-screw 66 movable within boss 57 and serving as a bearingfor the guidepin. It will be seen that manipulation of thumb-screw 66will change the tension of spring 65 and hence the pressure of thefeedroller upon the fabric.

A lifting lever is employed to raise the feed-roller against the actionof its spring, and for this purpose the extension E is provided with atransverse boss 67 adapted to receivea short rock-bar 68 which projectsfrom each face of the extension sufliciently to permit hand-operatedlifting-lever 69 and 'a treadle-operated arm 70 to be clamped thereto.The lever 69 is provided with a nose 69 which lies under a' roller 7l'onthe feed-roller supporting bracket 60. It will be seen that the bracket60 and the feedroller supported thereby may be elevated by hand pressureupon lever 69 or by actuation of the arm 70 through the intermediary ofa suitable treadle device, as desired.

A modified form of the improvements is illustrated in Figs. 5 to 8 ofthe drawings to adapt the same to a Singer machine of a type differentfrom that shown in Fig. 1. In the modification, the feed-rockercomprises the member 72 mounted upon a shaft 73 fitted within bearingsafforded by the bearing supports F and G rising from the bed-plate ofthe machine, and having the depending arm 74 connected by means ofpitman 75 and strap 7 5 with the adjustable feed-actuating eccentric 76on the mainshaft 4.

The enlarged rearwardly extending end of the feed-bar 77 is mounted upona pivotal stud supported within the bosses 72 on the feed-rocker. At itsforward end the feedbar is'provided with a yoke 78 which em braces ablock 79 mounted upon the feedlift eccentric. on the main-shaft, wherebyrising and falling movements are imparted to the main feed-dog 80. Theconstruction of the auxiliary feed-dog 33, the rocking carrier 30therefor, and the elbow-lever 12 which serves to transmit rising andfalling movements to the auxiliary dog, is the same in both forms of theimprovements. The feed-rocker72 is operatively connected to the carrier30 by means of a link-bar 81 secured at one end by means of stud screw81 to the depending arm 82 of the rocker and atits opposite end to aslotted crank-arm 83 clamped upon one of the carrier fulcrumpins 29. Theconnection between the feedrocker and the carrier 30 is an adjustableone to permit changes in the feeding movements of the auxiliary feed-dogrelatively to the main feed-dog and the adjustable feed-actuatingeccentric 76 permits regula-' tion of the stitch length bysimultaneously changing the effective movements of each feed-dog.

The elements employed to raise and lower the auxiliary feed-dog are thesame as those illustrated in Figs. 1% of the drawings, with theexception that a rockerand link are interposed betweenthe elbow-lever 42and the actuating pitman 51. The rocker in question comprises therock-shaft 84c mounted within the bearing support F and having clampedthereon at one end the slotted arm 85 which receives thestud-screw 86 ofthe pitman 51. Upon the opposite end of rock-shaft 8% is secured theupwardly extending arm 87 which carries a stud-screw'88 fitted withinthe enlarged apertured end of ashort link 89 having its opposite endfitted upon the stud 52 of elbow-lever 4:2. It will beseen that pitman51 will rock arm 87 and, through the link connection with elbow-lever42, will alternately raise and lower link 47 and the auxiliary dog 33connected therewith; and

it will also be seen that the adjustable conment of the auxiliary dog tocorrespond with I changes in the thickness of the material be-' ingacted upon.

The presser-roller 58 employed in the modification is constructedsimilar to that illustrated in Fig. 1 of the drawings. In themodification, however, the presser-roller is sustained by a forkedextension 9O of the lifting lever 90, and the latter is provided with atransverse bearing stud 91 which fits within the bearing bosses 92 of abracket 93 secured upon the head of the overhanging arm C. A coiledspring 94 having one end fitted within a socket formed in the head ofthe machine and its opposite end fitted within a socket formed in theinner face of ferent'thicknesses, and to prevent the pressure of'thefeed-roller upon the teeth of the auxiliary feed-clog when the materialis removed from the machine a detent-member 95 is provided to engage apin 96 projecting from the face of the lifting lever 90 where'- by thefeed-roller may be held slightly above the'toothed face of the auxiliaryfeed-dog. The detent-member may be moved endwise to varythe distancebetween the presserroller and the auxiliary feeddog, a clamp-- ing screw99 serving to hold the detent member in its adjusted position. Thepresser-roller may be elevated by pressure upon a hand piece h extendingfrom the lifting lever 90 above the head of overhanging arm C. I

In Fig. '8 of the drawings, a treadle-operated device is illustratedwhereby the presser-roller may be elevated by foot-pressuresimultaneously with the elevation of the presser-foot (not shown).Supported by two bracket 98' and 98 secured upon the overhanging arm C,is a rock-shaft 99,

' operated through treadle connections with chain 100 and rock-arm 101to simultaneously raise its connected arm 102 and swing inwardly its arm103, whereby the link-bar 104 connected intermediate arm 102 and acollar 105 on presser bar 79 is lifted to elevate the presser-foot, anda link 106 con- 'nected intermediate projecting pin 96 of thelifting-lever 90 and arm 108 is moved endwise'to rock the lifting-leverand thereby elevate the presser-roller 58.

'Upon the horizontal seats F and G afforded by the bearing supports Fand G is secured a work-plate section 107 partially cut awayintermediate its ends and formed The throat-plate 108 is provided withcrossbars 108* spaced to correspond with the grooves formed in theauxiliary feed-dog and presser-roller, said cross-bars being formed withconcaved lower faces so that the grooves 1n the auxiliary dog may bemade as shallow as possible without affecting the normal rise of the dogto work engaging position. The cross-bars 108 in the 1 throat-platepossesses a function not present in the usual sewing machinethroat-plate.

This function is to counteract the tendency of the arcuately-movableauxiliary feed-dog to pull the material downward in a plane intersectingthe work-plate, as the feeding progresses.

It will be understood that the invention is susceptible of variouschanges in the form and arrangement ofthe cooperating elements, inaddition to those of the m'odification above described, and that thesame is not limited to the in illustrated.

Having thus set forth the nature of tho invention, what I claim hereinis 1. In a puller feeding mechanism for sew-' precise embodimentshereing machines having a needle, the combination with a main feed-dogadjacent the needleand-an auxiliary feed-dog located remote from and inrearof the needle, of an actuating rocker common to both dogs andadapted to impart simultaneous feeding movements thereto, means forchanging the length of feed of both dogs simultaneously,

and means' for changing the length of feed' support to impart feedingmovements. to

the feed-dog and additional means ad justable upon the support andoperatively connected with said shaft for moving the feed dog relativelyto the support and into and out of feeding position.

3. In feeding mechanism for sewing machines, the combination with anactuating shaft, of a mam feed-[dog and lifting means therefor on saidshaft, a feed-rocker actuated by said shaft, a rocking support operatively connected to sald feed-rocker, an.

auxiliarv feed-dog mounted on said support for movement relativelythereto, means 1ncluding a lever fulcrumed upon said rocking support andoperatively connected with 1 the said actuating shaft for effectingrismg and falling movements to the auxil ary feed-dog, and a connectionbetween said feed-rocker and the main feed-dog.

4/111 feeding mechanism for sewing ma chines, the combination with anactuating shaft, of a feedrrocker and operative connectionsbetwee-n thesame and said actuat ing shaft, a rocking support provided with abearing sleeve, a feed-dog provided with a post adapted to slidewithinsaid bearing sleeve, an elbow-levermovable upon said rockingsupport, a connection between said elbow-lever and the feed-dog, a linkconnection between the feed-rockerand said rocking support andadjustable independently of the latter, and actuating means for saidelbow-lever.

5. In' feeding mechanism for sewing machines, the combination with afeed-dog and a post upon which the feeddog is mounted of a rock-barprovided with a. bearing-sleeve adapted "toreceive' the post of thefeed-clog, a block adjustably secured to saidsleeve and carrying afulcrum stud, an elbow-lever mounted u'pon said stud, a link connectionbetween the feed-dog and said elbow-lever,

an actuating shaft, actuating means con chines, the combination with anactuating shaft and a feed-rocker operatively connected thereto, of amain feed-dog connected to said feed-rocker, a rocking support, anauxiliary feed-dog mounted upon said rocking support, means for raisingand lowering the auxiliary feed-dog relatively to its rocking support,an operative connection between the feed-rocker and said rockingsupport, means for changing the length of movement of both feed-dogssimultaneously, and means for changing the length of movement of theauxiliary feed-dog relatively to the main feed-d0g.

7. A sewing machine having a main work advancing mechanism including afeed-dog and a cooperating Presser-foot in combina tion with pullerfeeding mechanism including an arcuately movable feed-dog and acooperating presser-member in rear of and spaced from the primary workadvancing mechanism, common means for imparting feeding movements tosaid dogs independent means for imparting lifting movements to saiddogs, and means for chan 'ng the feeding movements of the puller, eeddog Without varying the action of the main dog.

8. In feeding mechanism for sewing machines, the'combination with spacedmain and auzn'liary feed-dogs and a feed-rocker intermediate the same,of an actuating shaft provided with a feed-lift eccentric for the Copiesof thispatent may be obtained for five cents each, by addressing. the

main dog, an operative connection between said shaft and thefeed-rocker, an adjustable link connection between the feedrocker andthe main dog, a second rocker on which the auxiliary dog is slidinglymounted for endwise movement, a feed-lift lever carried by said secondrocker and connected with the auxiliary dog, an adjustable connectionbetween the feed-rocker and the second rocker, and an operativeconnection between the shaft and the feed-lift lever.

9. In a puller feeding mechanism for sewing machines havingstitch-forming mechanism including a needle, the combination with a mainfeed-dog having a feeding surface extending rearwardly of the needlethroughout the stroke of the feed-dog, of a supplemental feed-dogoperating in the rear of and spaced from the main dog, a main shaft,independent eccentrics on the mainshaft for imparting lifting movementsto both dogs and a single eccentric also on the mainshaft forsimultaneously imparting feeding movements to both dogs.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing Witnesses.

ALBERT H. DE VOE.

Commissioner of Patentu,

Washington, D. G.

